Function sumHorizontal

Sum all values horizontally across columns.

Example

 >>> const df = pl.DataFrame(
 ...     {
 ...         "a": [1, 8, 3],
 ...         "b": [4, 5, null],
 ...         "c": ["x", "y", "z"],
 ...     }
 ... )
 >>> df.withColumns(pl.sumHorizontal(pl.col("a"), ol.col("b")))
 shape: (3, 4)
 ┌─────┬──────┬─────┬──────┐
 │ a   ┆ b    ┆ c   ┆ sum  │
 │ --- ┆ ---  ┆ --- ┆ ---  │
 │ i64 ┆ i64  ┆ str ┆ i64  │
 ╞═════╪══════╪═════╪══════╡
 │ 1   ┆ 4    ┆ x   ┆ 5    │
 │ 8   ┆ 5    ┆ y   ┆ 13   │
 │ 3   ┆ null ┆ z   ┆ null │
 └─────┴──────┴─────┴──────┘
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